5 4 3 2 1 REVISION HISTORY ECO REV __ DESCRIPTION APPROVED PRODUCTION DAVID B. 3 DATE 2-26-15 R10 C55 1nF C113 33nF R150 14.3K R139 26.7K 5 C66 47nF 200V 1206 AG1 C102 0.1uF 0805 Q29 IRF6217 B R140 274 1/8W 0805 3 R109 10K AS C119 1nF 2 1 D30 ZHCS506 Q31 OPT RUN C73 1nF 24VOUT / 15A + C68 82uF 35V OPT 7343 2 R123 86.6K 0805 C105 0 R122 0 R43 0 +VOUT SGND 18 17 IS+ IS- VSOUT ITH SGD 11 7 19 R125 17.4K R115 4.42K 1/4W 1206 C74 0 12 VS+ 13 VS- R69 46.4K C75 100pF C -SENSE E6 OPT ITH +SENSE E5 VS- 470pF SYNC R124 OPT R126 OPT IS+ 3 28 21 NDRV 22 24 1 VCC C78 33nF R107 100 LTC3766EGN SSS R121 133K OPT - E4 C70 R113 OPT 1206 VCC C103 R116 VAUX U2 RS+ R106 100 VCC R112 0 -VOUT -VOUT VS+ Q27 FCX491A FS/SYNC PT- + C26 OPT 7343 0603 VCC R138 OPT VIN R111 0 R118 681K D34 ES1PD 4 3 C112 0.22uF 200V 1210 +VOUT 0 1 PT- C76 3.3nF R41 23.7K R42 1K 6 FB R119 OPT R120 VCC OPT R68 2.15K C79 4.7nF C77 4.7uF 1206 PGND R127 10K 1/4W 1206 C9 OPT R46 604 B COG 1 SGNDP PT+ C23 C25 + C7 OPT 7343 R7 RS0 R137 15 ND R8 0 C80 1nF 26 C111 PGND OPT MODE 4 28.7K SGND 1uF 16V 0805 + C31 OPT 7343 VPK 4 1T C71 R147 OPT IPK 1.25T 6 + C33 C34 10uF 50V 1210 J4 10 T2 0603 VAUX 1 AG AG1 R77 0 0805 SG TRANS-PA3493NL R103 0 C8 OPT FG R146 0 R114 +VOUT J3 RUN R6 OPT PHASE AG PGND 5.11K 1206 25 AG R75 2.61K 0805 5 4 AS R117 12.7K 3M 1225 -VOUT 3 R101 100 4 PGND IS+ IN- DELAY UV R22 3.74K C101 0.1uF 220pF 0805 16 R5 OPT 2512 + 321 R108 C30 2.2nF 7 8 2 PGND GND RCORE 1 SSFLT 9 11 GND2 C24 1uF 16V 0805 SGNDP LTC3765EMSE 17 13 C72 15 U1 RUN PSS RS- R102 RS+ 250V 1812 IN+ 6 12 1N4148WS VCC FS/UV 3 2 10 D40 1 NDRV E7 RUN PG 4 14 3 VCP 321 Q15 FDMS86201 Q14 FDMS86201 Q24 OPT SGND -VIN IS- R18 102K 0805 C118 1.5nF 4 R52 OPT 1206 RS- SGNDP R149 100 ISMAG C R136 0.005 1225/2512 PGNDP R148 100 R4 8.2K 2512 Q12 FDMS86201 Q13 FDMS86201 Q23 OPT 27 123 C10 2.2nF 630V 1206 FG R51 OPT 1206 8765 2 1 6 5 2 1 3 R29 100K 0805 Q28 FDC2512 8765 C69 OPT 1206 C106 150pF 200V D29 ZHCS506 CLAMP FG 5678 Q8 BSC190N15NS3 Q9 BSC190N15NS3 Q11 OPT D1 ES1PD SWB R53 6.8 1206 E3 +VOUT L3 6.8uH GND ND 4 0 20 1206 14 FG SGND R76 OPT 0805 R49 VIN 1 12 13 D -VOUT SW 23 IS+ 6 5 1206 R24 PGND SW 1 4T REGSD 3 4T Q3 OPT R9 OPT D28 OPT 3 -VIN R3 0 9 10 16 OPT 0805 D27 OPT 32 3 2 E2 R84 1 4 3 C5 4.7uF 100V 1210 C116 4.7uF 25V 1206 D38 BAS21 VSEC C4 4.7uF 100V 1210 C3 4.7uF 100V 1210 R23 20 C51 330pF 630V 1206 SS -VIN C6 4.7uF 100V 1210 680uH 9 33uF 80V VAUX L4 N18513387 20 C2 4.7uF 100V 1210 + C22 3 FGD/SWB 33uF 80V D37 BAS21 1 1 2 3 + C1 VA RUN 36V-60VIN R2 0 8 E1 T1 LTCP26-0404-S02 8 2T 14 2 3 L2 2.0uH 1 1 5 6 7 8 +VIN T3 OPT VIN 3 2512 2 1.0uH 0 2512 1 D L1 R1 0.33 R110 1.20 1206 1/2W ITH- SGND C11 15nF R151 100 SGNDP A NOTE: 4.7uF 100V MURATA, GRM32ER72A475KE14 (X7R 1210) 4.7uF 25V AVX, 12063C475KAT2A (X7R 1206) 10uF 50V MURATA, GRM32ER61H106MA12 (1210 X5R) 2.2nF 250V Murata GA343QR7GD222KW01L (X7R 1812) 82uF 16V PANASONIC, 35SVPF82M 33uF 80V PANASONIC, EEHZA1K330P (10x12.5mm) L1 Coilcraft XPL2010-102ML L2 Vishay IHLP4040DZER2R0M11 L3 Coilcraft SER2915L-682KL L4 Coiltronics SD25-681 Unless otherwise specified: 0.005 Ohm Susumu KRL6432D-M-R005-F-T5 (1225) All resistors are in ohms 0603. 0.003 Ohm Susumu KRL6432D-M-R003-F-T5 (1225) All capacitors are in microfarads 0603. R110 SUSUMU, RL1632S-1R20-F (1206) All capacitors are 25V. T1 Champs, LTC-PQ26-0404-S02 1/16W = 0402, 1/10W = 0603, 1/8W = 0805, T2 Pulse, PA3493NL CUSTOMER NOTICE 1/4W = 1206, 1W = 2512. 5 APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 2 TECHNOLOGY LT DAVID B. TITLE: SCHEMATIC SIZE N/A SCALE = NONE DATE: IC NO. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only ACTIVE CLAMP FORWARD CONVERTER WITH DIRECT FLUX LIMIT LTC3765EMSE / LTC3766EGN DC2199A-B Thursday, February 26, 2015 SHEET 1 1 REV. 3 OF 2 A 5 4 3 2 1 OPTIONAL CIRCUITS D D J1 FG R11 1.00K R13 6.8 2512 RSQ1 7 2 5 C16 56pF 1 6 4 3 ZXGD3002E6 CLAMP R14 6.8 2512 D2 OPT R25 1 OPT PSS PSS 2 R34 3 OPT R15 6.8 2512 4 5 C15 0.1uF 0805 6 Q4 FQD4P25 2 C14 0.1uF R17 100K 1206 SGNDP R19 1.5K R26 OPT SGND SSS SSS 7 R35 OPT 8 ITH R27 OPT VS+ R28 OPT 1 16 VDD B1 VSS2 VSS 1 Q1 C20 0.1uF VCC 15 4 A1 CRX 8 2 C13 10pF RES R12 4.99K 3 47pF 5 SO16 U3 HEF4528BT SGNDP C17 15nF 200V 1206 ACTIVE SNUBBER VSS1 C12 SW ITH RSITHC VS- ITH- R30 OPT VS- R31 OPT VS+ 9 10 11 PTSYNC PT- R32 OPT SYNC R33 OPT 12 13 14 1 2 3 4 5 6 7 8 9 10 C 11 12 13 14 OPT HD2X7-MOLEX AC DRIVER VCCP B 2 AG AG C18 OPT PGNDP 5 PGNDP 1 6 4 PEAK CHARGE VCC SW C19 Q2 OPT +VOUT OPT 2 AG1 AG1 C21 OPT 0805 D4 1 VA VPK VA 2 D35 OPT OPT 1 OPT 0805 3 C114 OPT 0805 PGND PGNDP A CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 B R152 4 3 2 TECHNOLOGY LT DAVID B. TITLE: SCHEMATIC SIZE N/A SCALE = NONE DATE: IC NO. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only ACTIVE CLAMP FORWARD CONVERTER WITH DIRECT FLUX LIMIT LTC3765EMSE / LTC3766EGN DC2199A-B Thursday, February 26, 2015 SHEET 2 1 REV. 3 OF 2 A